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Common Stock and Stockholders' Equity - Schedule of Stock Option and RSU Award Activities (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Number of Shares    
Beginning balance (in shares) 4,607  
Stock options granted (in shares) 449  
Stock options exercised (in shares) (1,232)  
Stock options canceled/forfeited (in shares) (230)  
Ending balance (in shares) 3,594 4,607
Weighted- Average Exercise Price    
Beginning balance (in usd per share) $ 17.49  
Stock options granted (in usd per share) 44.69  
Stock options exercised (in usd per share) 13.99  
Stock options canceled/forfeited (in usd per share) 26.01  
Ending balance (in usd per share) $ 21.54 $ 17.49
Weighted- Average Remaining Contractual Term (in years)    
Weighted- Average Remaining Contractual Term (in years) 7 years 16 days 7 years 1 month 5 days
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value, outstanding $ 90,339  
Stock options exercised 36,669  
Ending aggregate intrinsic value, outstanding $ 101,558 $ 90,339
Number of Shares    
Beginning balance (in shares) 1,978  
RSUs granted (in shares) 871  
RSUs vested (in shares) (387)  
RSUs canceled/forfeited (in shares) (282)  
Ending balance (in shares) 2,180 1,978
Weighted- Average Grant Date Fair Value    
Beginning balance (in usd per share) $ 29.32  
RSUs granted (in usd per share) 44.50  
RSUs vested (in usd per share) 30.19  
RSUs canceled/forfeited (in usd per share) 30.95  
Ending balance (in usd per share) $ 35.01 $ 29.32
Weighted- Average Remaining Contractual Term (in years)    
Weighted- Average Remaining Contractual Term (in years) 2 years 10 months 3 days 2 years 9 months 18 days
Aggregate Intrinsic Value    
Beginning aggregate intrinsic value, outstanding $ 73,309  
Ending aggregate intrinsic value, outstanding $ 108,585 $ 73,309